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Clarify, attempt to implement as internally documented.

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This commit is contained in:
Thomas Harte 2022-06-28 22:32:31 -04:00
parent c6b4570424
commit 60d3519993
2 changed files with 32 additions and 13 deletions
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37
Machines/Apple/AppleIIgs/MemoryMap.hpp
View File

@ -456,18 +456,27 @@ class MemoryMap {
// $6000–$a000 Odd banks only, rest of Super High-res
// [plus IO and language card space, subject to your definition of shadowing]
constexpr int shadow_shift = 10;
constexpr int auxiliary_offset = 0x10000 >> shadow_shift;
static constexpr int shadow_shift = 10;
static constexpr int auxiliary_offset = 0x1'0000 >> shadow_shift;
enum Inhibit {
TextPage1 = 0x01,
HighRes1 = 0x02,
HighRes2 = 0x04,
SuperHighRes = 0x08,
AuxiliaryHighRes = 0x10,
TextPage2 = 0x20,
};
// Text Page 1, main and auxiliary — $0400–$0800.
for(size_t c = 0x0400 >> shadow_shift; c < 0x0800 >> shadow_shift; c++) {
shadow_pages[c] = shadow_pages[c+auxiliary_offset] = !(shadow_register_ & 0x01);
shadow_pages[c] = shadow_pages[c+auxiliary_offset] = !(shadow_register_ & Inhibit::TextPage1);
}
// Text Page 2, main and auxiliary — 0x0800–0x0c00.
// TODO: on a ROM03 machine only.
for(size_t c = 0x0800 >> shadow_shift; c < 0x0c00 >> shadow_shift; c++) {
shadow_pages[c] = shadow_pages[c+auxiliary_offset] = !(shadow_register_ & 0x20);
shadow_pages[c] = shadow_pages[c+auxiliary_offset] = !(shadow_register_ & Inhibit::TextPage2);
}
// Hi-res graphics Page 1, main and auxiliary — $2000–$4000;
@ -480,8 +489,11 @@ class MemoryMap {
// (high-res graphics inhibit or auxiliary high res graphics inhibit) _and_ (super high-res inhibit).
//
for(size_t c = 0x2000 >> shadow_shift; c < 0x4000 >> shadow_shift; c++) {
shadow_pages[c] = !(shadow_register_ & 0x02);
shadow_pages[c+auxiliary_offset] = !(shadow_register_ & 0x12);
shadow_pages[c] = !(shadow_register_ & Inhibit::HighRes1);
shadow_pages[c+auxiliary_offset] = !(
shadow_register_ & (Inhibit::HighRes1 | Inhibit::AuxiliaryHighRes) &&
shadow_register_ & Inhibit::SuperHighRes
);
}
// Hi-res graphics Page 2, main and auxiliary — $4000–$6000;
@ -489,13 +501,20 @@ class MemoryMap {
//
// Test applied: much like that for page 1.
for(size_t c = 0x4000 >> shadow_shift; c < 0x6000 >> shadow_shift; c++) {
shadow_pages[c] = !(shadow_register_ & 0x04);
shadow_pages[c+auxiliary_offset] = !(shadow_register_ & 0x14);
shadow_pages[c] = !(shadow_register_ & Inhibit::HighRes2);
shadow_pages[c+auxiliary_offset] = !(
shadow_register_ & (Inhibit::HighRes2 | Inhibit::AuxiliaryHighRes) &&
shadow_register_ & Inhibit::SuperHighRes
);
}
// Residue of Super Hi-Res — $6000–$a000 (odd pages only).
//
// Test applied:
// auxiliary high res graphics inhibit and super high-res inhibit
for(size_t c = 0x6000 >> shadow_shift; c < 0xa000 >> shadow_shift; c++) {
shadow_pages[c+auxiliary_offset] = !(shadow_register_ & 0x08);
shadow_pages[c+auxiliary_offset] =
!(shadow_register_ & Inhibit::SuperHighRes && shadow_register_ & Inhibit::AuxiliaryHighRes);
}
}

8
OSBindings/Mac/Clock SignalTests/IIgsMemoryMapTests.mm
View File

@ -373,7 +373,7 @@ namespace {
});
// Test shadowed regions.
bool shadowed = false;
bool shouldBeShadowed = false;
int logical = 0;
for(NSNumber *next in test[@"shadowed"]) {
while(logical < [next intValue]) {
@ -384,12 +384,12 @@ namespace {
XCTAssertEqual(
isShadowed,
shadowed,
@"Logical page %04x %@ subject to shadowing", logical, shadowed ? @"should be" : @"should not be");
shouldBeShadowed,
@"Logical page %04x %@ subject to shadowing", logical, shouldBeShadowed ? @"should be" : @"should not be");
++logical;
}
shadowed ^= true;
shouldBeShadowed ^= true;
}
}];
}